/**
 * @file    hello.cpp
 * @author  Zhang WEN<3239711768@qq.com>
 * @date    Fri Sep 24 20:21:23 2021
 * @brief   This is my homework.
 *
 *
 */
#include<iostream>
/**
 *main function
 *
 * @param argc number of shell parameters.
 * @param argc strings for all parameters.
 *
 * @return system signals.
 */


int main(){
  std::cout<<"Hello World!"<< std::endl;
  return 0;
}
